1920 — The American Professional Football Conference (APFC), the precursor to the National Football League, was founded in Canton, Ohio. (More info.)

1938 — Extending his own record, Lou Gehrig of the New York Yankees hit his 23rd, and last, grand slam against Buck Ross of the Philadelphia A’s. Alex Rodriguez has since matched Gehrig’s 23 career slams. (More info.)

1955 — Golfer Arnold Palmer won his first professional tournament, the Canadian Open, at the Weston Club in Toronto. (More info.)